Thread-cutting device for sewing-machines



No. 757,463. PATENTED APR. 19, 1904.

'J. T. HOGAN. THREAD CUTTING DEVICEv FOR SEWING MACHINES.

APPLTUATION FILED JUNE 3, 1903.

no MODEL.

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WITNE S.SES:' I T I Z 6 "INVENTDR WM," M W V fffw xw g ATTORNEYS To ctZZ whom-it may concern.-

. zen ofthe United States of America, residing subsequent stitching operation.

- New Jersey, .useful Improvements in Thread-Cutting Deto the accompanying drawings,

- lower thread after asection of work has been completed and for holding the sewingoperation the thread will be'sevei'ed 'quent sewing operation.

lower thread ofthe stitching meelranismby jtion of a sewing-machine in which my im- NO. 757,463. I Patented April 19, 1904.

UNITED STATE PATENT OFFICE.

JAMES T. HOGAN, OF JERSEY CITY, NEW JERSEY,' ASSIGNOR TO THE NATIONAL MACHINE COMPANY, or MAMARONECK, NEW YORK, A CORPORATION or NEW YORK.

THREAD-CUTTING DEVICE FOR sswme-mAoi-amss.

SPECIFICATION forming part of Letters Patent No; 757,463, dated April 19, 1904.. I Application filed June 3, 1903. Serial No. 169,906. (No model.)

proved threadployed, certain portions of the machine being shown in front elevation and others in vertical longitudinal section. of the throat-plate. Fig. 3 is an under side view of the same. Fig. 4 is a View in vertical longitudinal section thereof, the plane of section being upon the lined 4 of Fig. 3.

I have shown in the drawings only such part ofa sewing-machine as is necessary for the complete understanding of my invention, it being understood that my thread cutting "and gripping attachment may be employed with any form of sewing machine, as may be desired.

. I have shown a conventional form of bed- Be it known that 1, JAMES T. Ho'oAN, acitiat Jersey City, county of Hudson, State of have invented certain new and vices for Sewing-Machines, of which the fol-" lowing is a specification, reference being had forming a part thereof. 7

My invention relates to improvements in thread-cutting devices for sewing-machines, and particularly to devices for cutting the free end of the lower thread until it has again been picked up in the commencement of a new piece of work. v y

To theseends my' invention consists ina thread-cutting knife arranged beneath the surface of the throat-plate of a sewing machine in such a position that when the work is removed or shifted after the completion of a ism 0, upper mechanism, including a vertically-reciprocating needle f. The throat-plated has the usual needle-opening g and is further provided. with an open-ended slot lb, extending laterally from the saidneedle-opening. The normal direction of feed of the work is in a line with the direction of the arrow in the drawings, and it will be seen that .the slot it extends substantiallyin a line with such path of movement.

, A thread-cutting knife 5 is secured beneath the upper surface of the throat-plate and extends transversely of the slot lb. Being located some little distance away die-hole the lower thread will thereby and, further, in a gripping device arranged in proximity. to the cutting-knife whereby the free end of the thread leading to the shuttle of the lower thread mechanism will beheld and retained until released by subses The objects of my inventionm'e to severthe.

normally pass the mereremovalof the worker the shifting of same other than that which takes place in the normal feeding operation and to 'hold the end-of'the severed thread in readiness for a engaged thereby. If the work, however, be removed ,by pulling it forward, as is usual, or if it be shifted forward a distance equal to or. I greater than the distance between theneedle- My invention further consists in certain de tails of construction and novel combination of parts, as will hereinafter more fully appear. I will now proceed to describe a device embodying my invention and will then point out the novel features in claims. I tionary abutment j and a spring clamping In? the drawings, Figure l is aview of a pormember k health the face of the cutting-knife z, whereby it will cutting knife 2?, the said cuttingcutting attachment is em-' from the neo justin advance of the said knife, but will not be hole and the knife-edge :while the stitching mechanism is at rest, the thread will be drawn is secured to the throat-plate be- Fig. 2is a top view plate a," throat-plate b, lower-thread mechanhead or arm 6, and upper-thread A thread-gripping device comprising a sta- 1 adjusting screw Z, Thepoint m,

knife being clamped in position between the stationary abutmentj andythe underside of the throat-plate. The member Jr bears against one, side face of the. stationary abutment j with a yielding pressure,- the extent of which maybe regulatedby means of a clamping and at which the i members. j and k unite, is in a line with-the- O approaches Qthecutting-ofi knife '5 it must pass between the portions 'j sloth and directly vbeneath same. For this reason'when; thethread enters the'slot h and and 70 andwill be olamped'thereby: When,therefore,the thread is finally severed by the knife 5, the free end of the-thread leading to the s'huttleof the lower thread-mechanism a will be gripped or retained by the'gripping device, and so held ready for the next stitching operation. When thread to be gripp .ing operation and that in the commencement. .of the next sewing operation the lower thread the next stitchingi'operation occurs theend 2o from the gripping'deviceby th'e normal feed- I ing movementrof the work, so that after the first two or three stitches have been made and of. the thread will be gradually drawn' away" the ends efthe thread firmly secured in the work the lower thread will be released from the gripping device and the stitching'operation may be continued as is usual.

In the employment of my device. it will be seen that the mere act of removing the work after a sewing operation has'been completed will. be sufficient to sever the lower thread and to cause the free shuttle end of thesaid ed ready for the next sew:

' will be held until it is secured to the work in the formation of the i will then be automatically released.

c I v; Itwill of course be obvious that the fore- 40 I j; and that the s'ameis capable of many-and going is but one embodiment of my invention I I varied modifications within the spirit and scope offiny invention and, further, that oer gtam partsjmaybe employed in connection with -ether .parts of different construction.

fien'ce'l'ltlo notfdesire to be limited only to A the precise detailsof construction and combi- -t atien of parts herein.

" What'1, ai r v11;". 1 a sewing-machine, the combination I withneedle and shuttletliread mechanism, and

', a throat plate havmg a needle-hole'therein and v a" slotiextending' a I -.;hole, of; afstat onary thread-cutting knife, ar-

laterally from I said needleranged transverselyof said slot and? beneath first 'few stitches, and

ment of thework will be in a direction away ed-to the. 1

of its side faces arranged substantially in a line with said slot, astationary-threadvcutting knife secured between said abutment. and the throat-plate, andw'ith itscutting edge cross: ing said slot and facing said "needlej-hole and a spring thread plamping member secured .to the side face of aline with said slot; 1 H 3; In a sewing machine;theicbmbination. with needle andshuttle thread mechanism, an a throat-plate having aneedle-hole therein and 7 saidstationar'y abutment; in v a slot extendingf laterally from: said needle:

hole; of a stationarythread cutting knife arranged beneath the npperj surface" of saidthroatplate, and withits cuttingedgeftrans" verse .o'f'the said slot and facing said needle hole, and a thread-gripping device secured to the said throat-plate iinmediateiybeneath said cutting-knife, and com'prisingla stationary abutment having one sidefface';substantiallggv in a line with saidslot, a spring gripping memhersecured thereto, and mean the tension of the saidspring member. r

with needle and shuttle thread mechanism;

a throat-plate having a needl'e hole therein and a slotextending, laterally from J-said needlei throat-plate, and 'wit hole,".and a thread in a line with said her engaging same,' and curing.said spring member to saidabutm'ent, said screw arranged upon fjust zthe tensionofgsaidspring member. I a '5'. In a sewing-machine, the combination the upper surface of said throat-plate and with its cutting edge facingsaid needlei-hole' and aspring-thread-gripping device arranged be? neath the said thread-cutting knife,.-the cutting edge of said knifefand the receiving end ,of said gripping device,arranged toface'in withlneedle andshuttle thread mechanism; and a throat-pl ate having aneedle-h'ole therein and 7 hole} offastationary thread-cutting knife ar throat-plate; and with-its the direction of feei, whereby feeding m'oves -hole, and a thread-gripping device secured v I gripping"devicefsecured to the said throat-plateimmediately beneath'said 1 cutting knife, and comprising. a stationary abutment havingone side Qfa'ce substantially slotgaspring gripping ine'mr' a j stment toad. ,v

' ins a slot extendingfqlaterallyfromgsaid needl e s for adjusting 4. "In-a sewing-machine;.'the; combination foo hole, ,of' a stationarythreadrcuttmgvknifear-]' ranged beneath the-upper surface of said j its cutting edge "trans- 95' verse *of the said-slot and'facing" said needle? an-adjustingl-screwse- 1 26 ranged beneath the -.upper surfaceiofjjsaid I utting edge-trans. :verse of the said slot andfacing said needle to the-said throat-plate immediately beneath said cutting-knife, and comprising a stationary Q-abutment having one side face substantially f -in a l-inewith said slot,-a spring gripping membeicomprising a single strip of spring metal arranged to engage the side face of said Slifla .tionary abutmentat two points, and a Secur ing and adjusting screw e gaging spring memher at a point intermediate its said points of I tensionof' said spring member.

- JAMES Guinean." Witnesses: \L t THos. F. GbwEGAN,

- Grnnnncr H. KBEOLL. 

